| A | B |
|---|
| humus | The part of soil made up of decayed parts of once-living things |
| erosion | The movement of weathered rock and soil |
| soil | The loose material in which plants can grow in the upper layer of Earth |
| topsoil | The top layer of soil made up of the smallest grains and the most humus |
| bedrock | The solid rock that is under soil |
| clay | A type of soil made up of very small grains; it holds water well |
| loam | A type of topsoil that is rich in minerals and has lots of humus |
| resource | A material that is found in nature and that is used by living things |
| conservation | The saving of resources by using them carefully |
| strip cropping | A type of planting that uses strips of thick grass or clover between strips of crops |
| contour plowing | A type of plowing for growing crops; creates rows of crops around the sides of a hill instead of up and down |
| sand | The type of soil that has large grains and feels gritty |
